Thursday, June 30, 2011

Is the Missouri River, the longest in the United States at 2,321 miles long, about to suffer a chain reaction failure beginning at the monolithic Fort Peck Dam in Montana, which itself is 21,026 feet long, 250 feet tall, and the largest earth-filled dam in the world?

The massive reservoir behind the world’s largest earth dam, Fort Peck Lake, is 134 miles long with 1,520 miles of shoreline, and reportedly holds enough water to equal the totality of the annual river run off – or one full year’s worth of the Missouri River’s flow.

According to Jody Farhat, chief of water management for the corps’ northwestern division, the six major Missouri River dams in the states of Montana (Fort Peck – the highest dam), North and South Dakota and Nebraska all will release record flows to make room for the incoming mountain runoff.

“We had a very heavy plains snowpack, and as that melted it used a fair amount of the storage that we had in our reservoirs.”

Farhat said this spring’s flood will be the most severe the region has seen since the Missouri River Mainstem Reservoir System was completed in the 1960s. (In other words, the dams have never been tested to this degree before.)

“We’re not going to get to peak releases until early July,” Farhat said. “This flood event is going to go on from now until early August.” (read more)